CN103848452A - Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process - Google Patents
Simple treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by series process Download PDFInfo
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Abstract
The invention belongs to the technical field of aluminum oxide smelting, and specifically relates to a simple novel treatment method of Bayer-process red mud and sintering-process silicon slag in aluminum oxide production by a series process. The simple treatment method comprises the following steps: carrying out solid-liquid separation to obtain pasty Bayer-process red mud after diluting Bayer-process dissolved-out slurry; mixing and then feeding part of Bayer-process red mud and sintering-process coarse liquor into a medium-pressure desilicication process, and carrying out solid-liquid separation onto the desilicication slurry after desilicication to obtain solid silicon slag; and synchronously feeding the silicon slag and the balance of the Bayer-process red mud into a one-step washing process, then filtering, feeding a filter cake to a sintering-process system to prepare raw slurry, and completing production of the aluminum oxide by virtue of a subsequent process of a conventional series-process. The production method disclosed by the invention not only overcomes the defect that a product obtained by the simple series process is low in quality, but also avoids a problem that high-quality aluminum oxide is obtained by adopting the conventional complex process, and therefore, process is simple, flow is reasonable, and high-quality metallurgical-grade aluminum oxide product can be efficiently and stably obtained through the series-process technique.
Description
Technical field
The invention belongs to aluminum oxide technical field of smelting, be specifically related to the Simple treatment method of Bayer process red mud and silica residue in sinter process in a kind of producing alumina through series process.
Background technology
Producing alumina through series process technique is one important in alumina-producing method.
The technical process (see figure 1) of processing Bayer process red mud and silica residue in sinter process in early stage series process is long and complicated, cause alumina product unit consumption high, be in particular in: one, Bayer process red mud is delivered to before sintering process system does Desilication seed, will be through 3～4 washings, thereby bring a large amount of water into Production Flow Chart, finally to lean on vaporizer that unnecessary water is evaporated away.Its two, adopt the repeatedly desilication process of atmospheric silicon removing and the combination of middle pressure-off silicon, and there is independently white residue separating and filtering system; In white residue attached liquid, contain a large amount of aluminum oxide and sodium oxide, they enter sintering process raw material with white residue and grind mixing system, then reenter in the middle of solution through high temperature sintering and grog stripping, belong to invalid circulation, both consume a large amount of energy and power, reduced again the efficiency of whole production system.Its three, the major part of solution that sintering process system produces is decomposed for carbonating, due to the easy crystallization of sodium carbonate in carbon mother liquid, makes vapo(u)rization system difficult, is unfavorable for reducing charge pulp moisture, has suppressed Dayao production capacity.
For above problem, in course of industrialization, develop again easy series process and processed the flow process (see figure 2) of Bayer process red mud and silica residue in sinter process, be characterized in: one, fully phase out the middle pressure-off silicon of crude liquor used sinter method, change crude liquor used sinter method and Bayer Process digestion slurries interflow atmospheric silicon removing into; Its two, cancel carbonating decomposition process, all alumina products are all decomposed and are obtained by seed.This simple and easy series process technique, difficult management, the production problem disadvantage how of having avoided numerous and diverse traditional technology to bring, improved production efficiency.But because the alumina loss of interflow atmospheric silicon removing is large, siliceous modulus is generally no more than 280, so most alumina product can only reach seconds standard.And, because sintering process can only be processed the part in Bayer process red mud, therefore the aluminum oxide losing when confluence desilication can not all reclaim by sintering process system, be also the one waste to resource.In addition the problem that, this technique does not solve Bayer process red mud yet and brings a large amount of nonproductive waters to sintering process system into.
Above two kinds of techniques, its Bayer process red mud all will, after three to four washings, just be delivered to sintering process batching, therefore all exists Bayer process red mud to bring the problem of a large amount of nonproductive waters into sintering process system.
Summary of the invention
The invention provides the Simple treatment method of Bayer process red mud and silica residue in sinter process in a kind of producing alumina through series process, it had both overcome the low drawback of simple and easy series process quality product, avoid again adopting traditional complicated technology to obtain the problem of high-quality aluminum oxide, technique is simple, flow process is reasonable, can efficiently, stably obtain high-quality metallurgical-grade aluminum oxide product.
The present invention is achieved through the following technical solutions:
A Simple treatment method for Bayer process red mud and silica residue in sinter process in producing alumina through series process, comprises the following steps:
(1) by carrying out solid-liquid separation after Bayer Process digestion slurry dilution, obtain pulpous state Bayer process red mud;
(2) send into middle pressure desiliconization process after step (1) gained part Bayer process red mud is mixed with crude liquor used sinter method, after desiliconization, gained desiliconization slurries obtain solid white residue through solid-liquid separation;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, then filter, gained filter cake is delivered to sintering process system and prepare charge pulp, and then complete the production of aluminum oxide by conventional series process subsequent handling.
According to above-mentioned Simple treatment method, step (1) is 8 ~ 12 by described Bayer Process digestion slurry dilution to solvent and solute weight ratio.
According to above-mentioned Simple treatment method, the solvent and solute weight ratio of step (1) gained pulpous state Bayer process red mud is 1.2 ~ 2.0.
According to above-mentioned Simple treatment method, the ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 10 ~ 60g:1L.
According to above-mentioned Simple treatment method, the described middle pressure-off silicon Working Procedure Controlling pressure of step (2) is 0.8 ~ 1.2MPa.
According to above-mentioned Simple treatment method, the Bayer process red mud that the described part Bayer process red mud of step (2) is 10 ~ 80wt%.
positive beneficial effect of the present invention:
First,, in the present invention, Bayer process red mud, without washing, directly as process for desiliconizing crude liquid obtained by sinter crystal seed, has shortened laterite washing flow process, has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 180～160kg/t-Bayer process; Secondly, white residue separation circuit can be separated with red mud, washing procedure merging, both simplify Production Flow Chart, save again occupation of land, reduce investment.
In sum, the present invention specifically has following outstanding advantages:
(1) simplified Production Flow Chart.Bayer process red mud is without washing, and directly, as the Desilication seed of crude liquor used sinter method, white residue separates and separates, washs merging with Bayer process red mud, has greatly simplified Production Flow Chart.
(2) save industrial land.The simplification of flow process also means has simultaneously saved industrial land.
(3) reduce investment outlay.Owing to having merged, white residue separation circuit separates with red mud, washing procedure, and facility investment and construction investment are all significantly reduced, and running cost is corresponding reduction also.
Accompanying drawing explanation
Fig. 1 is early stage series process Bayer process red mud and silica residue in sinter process processing technological flow schematic diagram;
Fig. 2 is simple and easy series process Bayer process red mud and silica residue in sinter process processing technological flow schematic diagram;
Fig. 3 is Bayer process red mud of the present invention and silica residue in sinter process processing technological flow schematic diagram.
Embodiment
Below in conjunction with accompanying drawing 3 and embodiment, the present invention is elaborated, but be used for anything but limiting the scope of the invention.
embodiment 1:
The Simple treatment method of Bayer process red mud and silica residue in sinter process in the present embodiment producing alumina through series process, comprises the following steps:
(1) by Bayer Process digestion slurry dilution to L/S(solvent and solute weight ratio) be to add separation tank to carry out solid-liquid separation after 10, it is 1.6 pulpous state Bayer process red mud that subsider underflow obtains L/S;
(2) by the Bayer process red mud of step (1) gained 50wt% without washing state under, after mixing with crude liquor used sinter method, send into middle pressure desiliconization process, this measure has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 160kg/t-Bayer process; Through separation tank solid-liquid separation, subsider underflow obtains solid white residue to gained desiliconization slurries after desiliconization (siliceous modulus is 480), and subsider overflow mixes with the overflow of red mud separation tank in order to the use of series process subsequent handling;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, enter washing settling groove, subsider underflow removes moisture through filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
The ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 60g/L; Described middle pressure-off silicon Working Procedure Controlling pressure is 0.8 ~ 1.2MPa.
embodiment 2:
The Simple treatment method of Bayer process red mud and silica residue in sinter process in the present embodiment producing alumina through series process, comprises the following steps:
(1) by Bayer Process digestion slurry dilution to L/S(solvent and solute weight ratio) be to add separation tank to carry out solid-liquid separation after 12, it is 2.0 pulpous state Bayer process red mud that subsider underflow obtains L/S;
(2) by the Bayer process red mud of step (1) gained 80wt% without washing state under, after mixing with crude liquor used sinter method, send into middle pressure desiliconization process, this measure has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 155kg/t-Bayer process; Through separation tank solid-liquid separation, subsider underflow obtains solid white residue to gained desiliconization slurries after desiliconization (siliceous modulus is 380), and subsider overflow mixes with the overflow of red mud separation tank in order to the use of sintering process subsequent handling;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, enter washing settling groove, subsider underflow removes moisture through filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
The ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 10g/L; Described middle pressure-off silicon Working Procedure Controlling pressure is 0.8 ~ 1.2MPa.
embodiment 3:
The Simple treatment method of Bayer process red mud and silica residue in sinter process in the present embodiment producing alumina through series process, comprises the following steps:
(1) by Bayer Process digestion slurry dilution to L/S(solvent and solute weight ratio) be to add separation tank to carry out solid-liquid separation after 8, it is 1.2 pulpous state Bayer process red mud that subsider underflow obtains L/S;
(2) by the Bayer process red mud of step (1) gained 10wt% without washing state under, after mixing with crude liquor used sinter method, send into middle pressure desiliconization process, this measure has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 180kg/t-Bayer process; Through separation tank solid-liquid separation, subsider underflow obtains solid white residue to gained desiliconization slurries after desiliconization (siliceous modulus is 400), and subsider overflow mixes with the overflow of red mud separation tank in order to the use of sintering process subsequent handling;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, enter washing settling groove, subsider underflow removes moisture through filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
The ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 30g/L; Described middle pressure-off silicon Working Procedure Controlling pressure is 0.8 ~ 1.2MPa.
embodiment 4:
The Simple treatment method of Bayer process red mud and silica residue in sinter process in the present embodiment producing alumina through series process, comprises the following steps:
(1) by Bayer Process digestion slurry dilution to L/S(solvent and solute weight ratio) be to add separation tank to carry out solid-liquid separation after 9, it is 1.4 pulpous state Bayer process red mud that subsider underflow obtains L/S;
(2) by the Bayer process red mud of step (1) gained 30wt% without washing state under, after mixing with crude liquor used sinter method, send into middle pressure desiliconization process, this measure has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 160kg/t-Bayer process; Through separation tank solid-liquid separation, subsider underflow obtains solid white residue to gained desiliconization slurries after desiliconization (siliceous modulus is 420), and subsider overflow mixes with the overflow of red mud separation tank in order to the use of sintering process subsequent handling;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, enter washing settling groove, subsider underflow removes moisture through filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
The ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 40g/L; Described middle pressure-off silicon Working Procedure Controlling pressure is 0.8 ~ 1.2MPa.
embodiment 5:
The Simple treatment method of Bayer process red mud and silica residue in sinter process in the present embodiment producing alumina through series process, comprises the following steps:
(1) by Bayer Process digestion slurry dilution to L/S(solvent and solute weight ratio) be to add separation tank to carry out solid-liquid separation after 11, it is 1.7 pulpous state Bayer process red mud that subsider underflow obtains L/S;
(2) by the Bayer process red mud of step (1) gained 60wt% without washing state under, after mixing with crude liquor used sinter method, send into middle pressure desiliconization process, this measure has reduced nonproductive water and has entered Production Flow Chart, reaches the dry red mud of 170kg/t-Bayer process; Through separation tank solid-liquid separation, subsider underflow obtains solid white residue to gained desiliconization slurries after desiliconization (siliceous modulus is 450), and subsider overflow mixes with the overflow of red mud separation tank in order to the use of sintering process subsequent handling;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, enter washing settling groove, subsider underflow removes moisture through filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
The ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 45g:1L; Described middle pressure-off silicon Working Procedure Controlling pressure is 0.8 ~ 1.2MPa.
The present invention is not limited to above-mentioned embodiment, and those skilled in the art also can make multiple variation accordingly, but scope any and that the present invention is equal to or similarly variation all should be encompassed in the claims in the present invention.
Claims (6)
1. a Simple treatment method for Bayer process red mud and silica residue in sinter process in producing alumina through series process, is characterized in that, comprises the following steps:
(1) by carrying out solid-liquid separation after Bayer Process digestion slurry dilution, obtain pulpous state Bayer process red mud;
(2) send into middle pressure desiliconization process after step (1) gained part Bayer process red mud is mixed with crude liquor used sinter method, after desiliconization, gained desiliconization slurries obtain solid white residue through solid-liquid separation;
(3) step (2) gained white residue is synchronizeed and sent into once washing operation with surplus Bayer process red mud, then filter, gained filter cake is delivered to sintering process system and prepare charge pulp.
2. Simple treatment method according to claim 1, is characterized in that: step (1) is 8 ~ 12 by described Bayer Process digestion slurry dilution to solvent and solute weight ratio.
3. Simple treatment method according to claim 1, is characterized in that: the solvent and solute weight ratio of step (1) gained pulpous state Bayer process red mud is 1.2 ~ 2.0.
4. Simple treatment method according to claim 1, is characterized in that: the ratio of step (2) Bayer process red mud used and crude liquor used sinter method is 10 ~ 60g:1L.
5. Simple treatment method according to claim 1, is characterized in that: the described middle pressure-off silicon Working Procedure Controlling pressure of step (2) is 0.8 ~ 1.2MPa.
6. Simple treatment method according to claim 1, is characterized in that: the Bayer process red mud that the described part Bayer process red mud of step (2) is 10 ~ 80wt%.
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| CN106315637A (en) * | 2015-07-03 | 2017-01-11 | 北京华索科技股份有限公司 | Filter cake reutilization method in production process of aluminum oxide and system thereof |
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